Which limitation constrained the early practical adoption of John Harrison's marine chronometer design during mid-18th century navigation?

💡 Explanation

When Harrison's chronometers were introduced, the need for precise calibration by skilled instrument makers significantly slowed widespread adoption because training and expertise were limited at the time, restricting manufacturing and maintenance. Therefore, the calibration requirement was key, rather than pressure, 'g-force', or magnetism issues which Harrison's designs effectively mitigated.

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